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Jun 10, 2011 at 7:27 vote accept mogron
Jun 10, 2011 at 7:26 comment added mogron Thanks to your answer and the comments above I think I understand now - we never get a surface bundle, since the incompressible tori we use to split are not boundary-parallel.
Jun 10, 2011 at 1:43 history answered yanqing CC BY-SA 3.0